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Schedule II-Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 28, 2019 | Sep. 29, 2018 | Sep. 30, 2017
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |
Beginning of period |  | $ 37,249 |  |
End of period |  | 58,411 | $ 37,249 |
Allowance for doubtful accounts [Member] |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |
Beginning of period |  | 385 | 79 | $ 506
Charged to Costs and Expenses |  | 212 | 383 | (136)
Other Additions |  | 0 | 0 | 0
Other Deductions | [1] | 0 | (77) | (291)
End of period |  | 597 | 385 | 79
Inventory reserve [Member] |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |
Beginning of period |  | 26,889 | 24,639 | 21,080
Charged to Costs and Expenses |  | 2,657 | 4,897 | 10,925
Other Additions |  | 0 | 0 | 0
Other Deductions | [2] | (233) | (2,647) | (7,366)
End of period |  | 29,313 | 26,889 | 24,639
Valuation allowance for deferred taxes [Member] |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |
Beginning of period |  | 37,249 | 29,614 | 27,381
Charged to Costs and Expenses | [3] | 0 | 0 | 0
Other Additions |  | 21,162 | 7,635 | 2,233
Other Deductions |  | 0 | 0 | 0
End of period |  | $ 58,411 | $ 37,249 | $ 29,614
[1] | Represents write-offs of specific accounts receivable.
[2] | Sale or scrap of previously reserved inventory.
[3] | Reflects increase/decrease in the valuation allowance primarily associated with the Company's U.S. and foreign net operating losses and other deferred tax assets.

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- Definition Amount of increase (decrease) in valuation and qualifying accounts and reserves from adjustment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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